Mexican Opposition Clears First Hurdle in Bid for Energy Referendum

MEXICO CITY—Mexico’s main leftist political party has gathered enough valid signatures to request a national referendum as it seeks to undo the recent opening of the energy sector driven by President Enrique Peña Nieto, officials at the national electoral agency said.

The referendum proposal requires Supreme Court approval. It has been promoted by the leftist Party of the Democratic Revolution, or PRD, and obtained more than 2 million valid signatures, well above the required 1.6 million, one official said. Another...